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Reliability-based design of augered cast-in-place piles in granular soils / Armin W. Stuedlein in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 6 (Juin 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 6 (Juin 2012) . - pp. 709–717 Titre : Reliability-based design of augered cast-in-place piles in granular soils Type de document : texte imprimé Auteurs : Armin W. Stuedlein, Auteur ; William J. Neely, Auteur ; Thomas M. Gurtowski, Auteur Année de publication : 2012 Article en page(s) : pp. 709–717 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Deep  foundations  Reliability  Loading  tests  Statistics  Resistance  factors  Design Résumé : Although a variety of methods exist to estimate axial capacity for augered cast-in-place piles, they are generally limited to allowable stress design (ASD) procedures, with little consideration of design reliability. This paper describes the addition of static loading test results to a global augered cast-in-place pile data set to assess the accuracy of new and existing design methods and to address the current lack of reliability-based design methods for augered cast-in-place piles. The new static loading tests in western Washington were carried out on piles installed in granular materials, with pile diameters and lengths ranging from 0.41 to 0.51 m and 9.5 to 29 m, respectively. The preparation of beta coefficients and unit toe bearing resistance values is discussed within the framework of strain-dependent composite tangent moduli and observed residual loads. New relationships for the beta coefficient and toe bearing resistance values are proposed, and the accuracy of new and existing design procedures is statistically characterized using the updated global data set. Resistance factors for axial compression and uplift are calibrated at the strength limit for use in load and resistance factor design (LRFD). ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000635 [article] Reliability-based design of augered cast-in-place piles in granular soils [texte imprimé] / Armin W. Stuedlein, Auteur ; William J. Neely, Auteur ; Thomas M. Gurtowski, Auteur . - 2012 . - pp. 709–717. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 6 (Juin 2012) . - pp. 709–717 Mots-clés : Deep  foundations  Reliability  Loading  tests  Statistics  Resistance  factors  Design Résumé : Although a variety of methods exist to estimate axial capacity for augered cast-in-place piles, they are generally limited to allowable stress design (ASD) procedures, with little consideration of design reliability. This paper describes the addition of static loading test results to a global augered cast-in-place pile data set to assess the accuracy of new and existing design methods and to address the current lack of reliability-based design methods for augered cast-in-place piles. The new static loading tests in western Washington were carried out on piles installed in granular materials, with pile diameters and lengths ranging from 0.41 to 0.51 m and 9.5 to 29 m, respectively. The preparation of beta coefficients and unit toe bearing resistance values is discussed within the framework of strain-dependent composite tangent moduli and observed residual loads. New relationships for the beta coefficient and toe bearing resistance values are proposed, and the accuracy of new and existing design procedures is statistically characterized using the updated global data set. Resistance factors for axial compression and uplift are calibrated at the strength limit for use in load and resistance factor design (LRFD). ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000635